Several teams have inquired about Cammalleri's availability, including the New Jersey Devils, Los Angeles Kings, Ottawa Senators and San Jose Sharks.
It's unclear what the Flames are asking for in exchange for Cammalleri, though reports suggest a top prospect and a high draft pick is what Calgary might accept.
Cammalleri, 31, is in the final year of his contract and is scheduled to become an unrestricted free agent July 1.
The Flames are also entertaining calls for right wing Lee Stempniak, forward T.J. Galiardi and defenseman Chris Butler.
Stempniak and Butler are also pending unrestricted free agents, while Galiardi can become a restricted free agent this summer.